For pictures, the value in an existing object can also be used as default duration. For this purpose, right-click the corresponding picture object and select Ramp 
Set durations as default.For certain types of objects (picture, live video, text, data and switch objects) a default duration can be entered. This is done in the Global Options for the corresponding type of objects:
For pictures, the value in an existing object can also be used as default duration. For this purpose, right-click the corresponding picture object and select Ramp Set durations as default.